I just have a load test in JMeter, in the test, the client will send several requests in few seconds. But I find a problem when the client makes a new request, the JMeter will close the former connection and create a new connection, I just want to reuse the former connection to send a request to the WebSocket server.enter image description here
Just tick use existing connection box in your WebSocket Samplers and the connection established by the WebSocket Open Connection sampler will be re-used
I believe the connection doesn't survive Thread Group iterations (it's basically re-established when Open Connection sampler is executed 2nd time, if you need to repeat the request more than once - either go for Loop Controller or put the Open Connection sampler under the Once Only Controller
More information: JMeter WebSocket Samplers - A Practical Guide
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How to use existing websocket connection to another websocket request in jmeter?
When I tried to use existing connect then as result it show me an error "Sampler configured for using existing connection, but there is no connection" . Please refer attached screenshot.
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It looks like you're using 2 different WebSocket Samplers implementations:
JMeter-WebSocketSampler
and JMeter WebSocket Samplers
Your WebSocket Single Write Sampler:
Doesn't know anything about the connection established by the WebSocket Sampler
The WebSocket Sampler closes the connection after receiving the response
So if you want to continue with the WebSocket Single Write Sampler you need to:
Use WebSocket Open Connection sampler to establish the connection:
In the WebSocket Single Write Sampler tick use existing connection box
More information: JMeter WebSocket Samplers - A Practical Guide
If you want to continue with the WebSocket Sampler - tick Streaming connection box:
and remove the WebSocket Single Write Sampler and friends from the Test Plan
I am using JMeter to test our websockets server API and now I have the following issue. I need to open and keep multiple WS at the same time to be able to use them in parallel.
JMeter WebSocket Samplers plugin provides possibility:
To open a WebSocket connection via WebSocket Open Connection sampler
And then you can re-use the connection in the following Samplers which will be doing the real work: read, write
When you don't need the connection anymore you can use WebSocket Close sampler
The connections are established "per thread" (virtual user) so provide necessary amount of concurrent threads in the Thread Group and make sure to specify enough loops or the desired duration of the test
More information: JMeter WebSocket Samplers - A Practical Guide
I am using a plugin (WebSocket Samplers by Peter Doornbosch) to establish the WebSocket connection in JMeter and trying to send the request message over it but receiving below error in logs
ERROR - eu.luminis.jmeter.wssampler.RequestResponseWebSocketSampler: Unexpected frame type received in sampler 'WebSocket request-response Sampler': Close frame with status code null and close reason 'null'
My test plan consists of "WebSocket Open Connection", "Web-socket request-response sampler" and "web-socket ping/pong frame filter". And I feel there is no issue in establishing the connection but something is wrong while sending the request or receiving a response.
Also, tried checking the logs from the server but didn't find any requests which were sent using JMeter.
Implemented another available plugin too in Jmeter to test the WebSocket but seeing similar behavior. Any help would be highly appreciated.
It looks like you're using the wrong sampler type, looking into the error you're getting it makes more sense to use single-write sampler which is designed for sending one (text or binary) WebSocket frame.
You might want to use a sniffer tool like Fiddler or Wireshark to capture the traffic between your browser (or application) and the backend and see what types of frames are going, which direction, is single connection re-used or each time new one is established, etc.
You may also find the following links useful:
Example scripts collection
JMeter WebSocket Samplers - A Practical Guide
The problem is that your server is actively closing the connection. Usually, this is caused by the client sending a request that the server does not understand. In your case, it's very likely that the request you are sending in the request-response sampler is not accepted by the server. As Dmitri suggests, the best way to find out how a "normal" client communicates with the server is to capture a session with WireShark and model your testplan accordingly.
Hth.
In my JMX file, I am using WebSocket single reader sampler and running the no of users as 2450 with ramp-up time is 150 sec. But after a few minutes, I am getting the below error.
WebSocket Single Read Sampler, Sampler error, "Sampler configured for using the existing connection, but there is no connection", Thread Group 1-18
It might be the case your application gets overloaded and cannot setup the connection within the bounds of 20 seconds default timeout therefore WebSocket Open Connection fails and hence when WebSocket Single Read Sampler is being executed there is no connection to "read" from and it fails as well.
If you want to avoid this type of errors the options are in:
Choose different behaviour on Sampler error under Thread Group:
Put your WebSocket Single Read Sampler under the If Controller and click "Use status of last sample" button, this way all the If Controller's children will be executed only if open connection sampler will be successful:
We are planning to do load testing of our server and we need to generate heavy load from Jmeter tool. But as per i know, jmeter waits for the response to create another request thread. Is there a way to create http request without waiting for response from the server using jmeter? if not, what are the available work around to generate heavy load keeping number of threads fixed?
Define a very small timeout in the HTTP Request sampler (or even better in HTTP Request Defaults so the setting would be applied to all HTTP Request samplers) like 1 millisecond so JMeter will close the connection right after sending the request
(Optional) To avoid JMeter marking requests as failed add Response Assertion and tick Ignore Status box
You can set in HTTP Request in the Advanced tab Timeout of Connect and Response with 1 ms
Connect Timeout Connection Timeout. Number of milliseconds to wait for a connection to open.
Response Timeout Response Timeout. Number of milliseconds to wait for a response. Note that this applies to each wait for a response.
If you need to return always success you can add with JSR223 PostProcessor and use prev variable:
prev.setSuccessful(true)